Ok well I've done some looking and the most realistic options are
AE82 with a A-series engine
KE70/AE71 with A-series engine
Both weigh in around the mid-high 900kg mark, and I'd say a further 50kg could come out fairly easily being mid-low 900kg mark in the end. That's say 10-15% lighter than an SX or GTi both of which go quite well.
A 100kw/20V/7AFE would liven things up a touch but still retain factory fit & finish and Toyota reliability.
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